1 files changed, 22 insertions, 19 deletions
diff --git a/lisp/km-magit.el b/lisp/km-magit.el
index 45b2860..58c8332 100644
--- a/lisp/km-magit.el
+++ b/lisp/km-magit.el
@@ -173,31 +173,34 @@ START-POINT set to the current branch.
                                           (concat it "-tmp")))))
   (magit-run-git "checkout" "-b" branch))
 
-(defun km/magit-branch-backup-current (&optional choose-name)
+(defun km/magit-branch-backup-current (&optional choose-suffix)
   "Create a backup branch for the current branch.
-With the prefix argument CHOOSE-NAME, prompt for the name of the
-backup branch.  Otherwise, name it as 'b/<current-branch>__v<n>',
-where <n> is incremented to form a refname that doesn't already
-exist."
+Name it as 'b/<current-branch>__v<n>', where <n> is incremented
+to form a refname that doesn't already exist.  With the prefix
+argument CHOOSE-SUFFIX, prompt for a suffix to use instead of
+'v'."
   (interactive "P")
   (let ((current (or (magit-get-current-branch)
                      (user-error "No current branch"))))
     (magit-run-git
      "branch"
-     (if choose-name
-         (magit-read-string-ns "Backup name" current)
-       (let* ((version-re (format "\\`%s__v\\([[:digit:]]+\\)\\'"
-                                  (regexp-quote current)))
-              (versions (delq nil
-                              (mapcar
-                               (lambda (s)
-                                 (and (string-match version-re s)
-                                      (string-to-number
-                                       (match-string-no-properties 1 s))))
-                               (magit-list-local-branch-names)))))
-         (format "%s__v%d"
-                 current
-                 (if (null versions) 1 (1+ (apply #'max versions)))))))))
+     (let* ((suffix (if choose-suffix
+                        (magit-read-string-ns "Backup suffix")
+                      "v"))
+            (version-re (format "\\`%s__%s\\([[:digit:]]+\\)\\'"
+                                (regexp-quote current)
+                                (regexp-quote suffix)))
+            (versions (delq nil
+                            (mapcar
+                             (lambda (s)
+                               (and (string-match version-re s)
+                                    (string-to-number
+                                     (match-string-no-properties 1 s))))
+                             (magit-list-local-branch-names)))))
+       (format "%s__%s%d"
+               current
+               suffix
+               (if (null versions) 1 (1+ (apply #'max versions))))))))
 
 (defun km/magit-branch-archive (branches)
   "Move BRANCHES from refs/heads/ to refs/archive/."